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Ceph Day Chicago - Deploying flash storage for Ceph without compromising performance
1.
Ceph Day Chicago
– August 16, 2015 Deploying Flash Storage For Ceph Rob Davis – robd@mellanox.com
2.
© 2015 Mellanox
Technologies 2 End-to-End Networking Solutions Storage Front / Back-End Server / Compute Switch / Gateway 56-100G InfiniBand 10-100GbE Host/Fabric SoftwareICs Switches/GatewaysAdapter Cards Cables/Modules Comprehensive End-to-End InfiniBand and Ethernet Portfolio Metro / WAN 56-100G InfiniBand 10-100GbE
3.
© 2015 Mellanox
Technologies 3 Embedded Inside Storage Platforms Across the Industry SMB Direct
4.
© 2015 Mellanox
Technologies 4 Disk Drive Shipments Continue to Grow
5.
© 2015 Mellanox
Technologies 5 Solid State Disk Growth Today
6.
© 2015 Mellanox
Technologies 6 HDD vs. SDD cost projections Source:Wikibon2014,fromnumeroussources
7.
© 2015 Mellanox
Technologies 7 The Performance Difference is Dramatic 0.1 10 1000 HD SSD NVM AccessTime(micro-Sec) Storage Media Technology AccessTimeinMicroSeconds Hard Drives NAND Flash Next Gen NVM
8.
© 2015 Mellanox
Technologies 8 Four Year Life Cycle TCO – HDD vs. SSD Source:Wikibon2014,fromnumeroussources
9.
© 2015 Mellanox
Technologies 9 Ceph and Network Traffic APIs enable access to object, block & file data Fully distributed scale out architecture Source: http://ceph.com/docs/master/rados/configuration/network-config-ref/
10.
© 2015 Mellanox
Technologies 10 Cluster Network Traffic – Sunny Day Scenarios Client OSD Write Write Ack OSD OSD Replications N Write Operation Client OSD Read Read Reply OSD OSD N READ Operation No extra cluster network traffic Typically 2x cluster network traffic (N-1)∙x
11.
© 2015 Mellanox
Technologies 11 Flash Can Move the Bottleneck from the Disk to the Network Network I/O should match Disk I/O
12.
© 2015 Mellanox
Technologies 12 Where best to plug in?
13.
© 2015 Mellanox
Technologies 13 Classic Network Architecture
14.
© 2015 Mellanox
Technologies 14 New Leaf-Spine Architecture Greater Cross-sectional Bandwidth
15.
© 2015 Mellanox
Technologies 15 Recovery backend traffic 1x times lost data Cluster Network Traffic – Recovery (Replication) Example - Time to recover Net networking time to move data 10GbE • 20TB system @10GE 4.4hrs • 200TB system @10GE 44.4hrs 40GbE • 20TB system @40GE 1.1hrs • 200TB system @40GE 11.1hrs 100GbE • 20TB system 100GE 0.4hrs • 200TB system @100GE 4.44hrs Client OSD OSD OSD OSD Read Read Reply
16.
© 2015 Mellanox
Technologies 16 The Effect of Replication vs. Erasure Coding
17.
© 2015 Mellanox
Technologies 17 Cluster Network Traffic – Sunny Day Scenarios (Erasure Coding) Client OSD Read Read Reply K OSD OSD OSD OSD OSD M Read Shards decode READ Operation Client OSD Write Write Ack K OSD OSD OSD OSD OSD M Write Shards encode Write Operation ~1x cluster network traffic ((k-1)/k)∙x Typically ~1.4x cluster network traffic ((k+m-1)/k) ∙x
18.
© 2015 Mellanox
Technologies 18 Ceph with Flash is Best with a Separate Cluster Network High performance networks enable maximum cluster availability • Clients, OSD, Monitors and Metadata servers communicate over multiple network layers • Real-time requirements for heartbeat, replication, recovery and re-balancing • Flash only adds to the network performance requirement Cluster (“backend”) network performance dictates cluster’s performance and scalability • “Network load between Ceph OSD Daemons easily dwarfs the network load between Ceph Clients and the Ceph Storage Cluster” (Ceph Documentation)
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© 2015 Mellanox
Technologies 19 Ceph Flash Deployment Using Cluster Network Cluster (Private) Network @ 40GbE • Smooth HA, unblocked heartbeats, efficient data balancing Clients @ 1, 10 or 40GbE • 40 GbE guaranties line rate for high ingress/egress clients IOPs and Throughput to Clients @ 1, 10, or 40GbE 2.5x Higher Throughput , 15% Higher IOPs with 40Gb Ethernet vs. 10GbE (http://www.mellanox.com/related-docs/whitepapers/WP_Deploying_Ceph_over_High_Performance_Networks.pdf) Cluster Network Admin Node 40GbE Public Network 10GbE/40GBE Ceph Nodes (Monitors, OSDs, MDS) Client Nodes 10GbE/40GbE
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© 2015 Mellanox
Technologies 20 Reference Architecture for Ceph and Flash Red Hat, Supermicro, Seagate, Mellanox, Intel Extensive Ceph Performance Testing: Disk, Flash, Network, CPU Reference Architecture Published 40GbE Network Setup Key Test Results • 2 SSDs as fast as many disks, more flash is faster 40GbE Advantages • Up to 2x read throughput per server • Up to 50% decrease in latency http://www.redhat.com/en/resources/red-hat-ceph-storage-clusters-supermicro-storage-servers
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© 2015 Mellanox
Technologies 21 Ceph Flash Optimized Solution Highlights Compared to Stock Ceph • Read performance up to 8x better • Write performance up to 2x better with tuning Optimizations • All-flash storage for OSDs • Enhanced parallelism and lock optimization • Optimization for reads from flash • Improvements to Ceph messenger Tested Configuration • InfiniFlash Storage with IFOS 1.0 EAP3 • Up to 4 RBDs • 2 Ceph OSD nodes, connected to InfiniFlash • 40GbE NICs from Mellanox SanDisk InfiniFlash
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© 2015 Mellanox
Technologies 22 SanDisk InfiniFlash, Maximizing Ceph Random Read IOPS Random Read IOPs Random Read Latency (ms) 0 20000 40000 60000 80000 100000 120000 140000 160000 180000 200000 25% Read 50% Read 75% Read 100% Read 8KB Random Read, QD=16 Stock Ceph IF-500 0 2 4 6 8 10 12 14 25% Read 50% Read 75% Read 100% Read 8KB Random Read, QD=16 Stock Ceph IF-500 http://www.sandisk.com/about-sandisk/press-room/press-releases/2015/sandisk-creates-new-storage-category-with-infiniflash%E2%84%A2-all-flash-storage-system/
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© 2015 Mellanox
Technologies 23 Ceph/Flash Media & Entertainment Solution Turnkey Object Storage • Built on Ceph • Pre-configured for rapid deployment • Mellanox 10/40GbE networking High-Capacity Configuration • SSDs and 6-8TB Helium-filled drives • Up to 2PB in 18U High-Performance • Single client read 2.2 GB/s • SSD caching + Hard Drives www.storagefoundry.net
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© 2015 Mellanox
Technologies 24 Flash Performance Creates Bottleneck in Network Software 50% 100% Networked Storage Storage Protocol (SW) Network Storage Media Network HDD SSD Storage Media 0.01 1 100 HD SSD NVM FC, TCP RDMA RDMA+ AccessTime(micro-Sec) Protocol and Network NVM HDD The Network and the Protocol MUST get faster
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© 2015 Mellanox
Technologies 25 NVMe Express – Protocol Designed for Flash NVMe: Optimized for flash and next-gen NV- memory • Traditional SCSI interfaces designed for spinning disk • NVMe bypasses unneeded layers NVMe Flash Outperforms SAS/SATA Flash • 2x-2.5x more bandwidth, 40-50% lower latency, Up to 3x more IOPS
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© 2015 Mellanox
Technologies 26 RDMA Enables More Efficient Networking for Ceph Higher Bandwidth Lower Latency More CPU Power For Applications
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© 2015 Mellanox
Technologies 27 Adding RDMA to Ceph RDMA Beta Included in Hammer • Open Source: Mellanox, Red Hat, CohortFS, and Community collaboration • Full RDMA expected in Infernalis • New RDMA messenger layer called XioMessenger, built on Accelio (RDMA abstraction layer)
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© 2015 Mellanox
Technologies 28 Open source • https://github.com/accelio/accelio/ && www.accelio.org Faster RDMA integration to application Asynchronous Maximize msg and CPU parallelism • Enable >10GB/s from single node • Enable <10usec latency under load In Giant and Hammer • http://wiki.ceph.com/Planning/Blueprints/Giant/Accelio_RDMA_Messenger Accelio, High-Performance Reliable Messaging Library
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© 2015 Mellanox
Technologies 29 RDMA Enables Efficient Data Movement for Windows SDS Without RDMA • 5.7 GB/s throughput • 20-26% CPU utilization • 4 cores 100% consumed by moving data With Hardware RDMA • 11.1 GB/s throughput at half the latency • 13-14% CPU utilization • More CPU power for applications, better ROI x x x x 100GbE With CPU Onload 100 GbE With Network Offload CPU Onload Penalties • Half the Throughput • Twice the Latency • Higher CPU Consumption 2X Better Bandwidth Half the Latency 33% Lower CPU See the demo: https://www.youtube.com/watch?v=u8ZYhUjSUoI
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© 2015 Mellanox
Technologies 30 Conclusions Flash storage is main stream and approaching price parity with hard disks The performance difference between flash and hard disks is dramatic and with the right network, Ceph can easily leverage this Its important to balance the storage and network performance in OSDs A separate high performance “Cluster” network is usually needed to realize the full performance advantage of flash in Ceph systems RDMA can further optimize Ceph flash performance
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Thank You
Notes de l'éditeur
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